Are all the readings you’ve had to do essential or were they classed as ‘recommended’?
You’ve just started so everything might seem quite overwhelming but you’ll soon pick up tricks on how to manage the workload. For example if the readings are just for seminar discussions do you need to be reading them thoroughly? Or can you just skim read?
Also make sure to be talking to your classmates to see how they’re coping. If you’re still really struggling in a few weeks, talk to your personal tutor or seminar leader.